Filter



P" E. MYWILSON 2,439,535

FILTER Filed Sept. 16, 1944 2 Sheets-Sheet 2 la". m

I ELLSWORTH M. WILSON g 8 M.

ATTORNEYS.

Patented Apr. 13, 1948 FILTER aummh M.

to Remington Conn.,

Wilson, Southport,

Arms Company, a corporation of Delaware Conn., asslgnor Inc.,Bridgeport,

. Application September 16, 1944, Serial No. 554,416 Claims. (Cl.210-169) This invention relates to a filter assembly which may be usedto advantage in washing'machines, and, particularly, those of the homedishwasher and home clothes-washing type. The device will be describedin conjunction with a dish-washing machine, but it is to be distinctlyunderstood that it may be used for other washing machines and otherpurposes. a

It is desirable to the aforementioned provide washing machines of typewith a filter for removing foreign material in the water. This isparticularly true of a dishwasher wherein a comparatively small amountof water is recirculated pump which requires removal of foreignmaterial. The filter or strainer must be so arranged that it easily canbe cleaned.

These and other objects of the invention may be seen from the followingdrawings and descrip- Fig. 2 is a sectional side elevation of the filterwhen in place in the machine of Fig. 1, debris or dirt beingdiagrammatically shown on the elements of the filter.

Fig. 3 is a vertical section taken along the line 33 of Fig. 2.

Fig. 4 is a broken vertical section taken along the line 4-4 of Fig.2.

Fig. 5 is 'similar to Fig. 2, with the exception that the filter rodassembly is partially withdrawn.

Fig. 6 is similar to Fig.

withdrawn.

Fig. 7 is similar to Fig. 6, with the exception that the cleaning andguide plate has been operated to remove debris from the assembly.

position in the machine.

Referring to Fig. 1, a dishwasher is shown having an outer casing 29with a front door 2| and removable dish rack 22 held in tray support 23.A rotor 24 is driven by motor 23 for circulating a water spray upwardlyabout the dishes contained in dish basket 22. All of these features areconventional and may take this or other forms well known in the'art. Thewater returning from the spray is caught in the bottom 21 of the spraycompartment 28 5, with the exception that the filter rod assembly hasbeen completely and directed to the opening 29 so as to pass throughthefilter assembly. During the washing cycle, water passing through thefilter assembly enters the chamber 3| and is then carried into chamber32 where it is drawn into the rotor 24 and again circulated over thedishes. Drain valve 33 is provided'for' removing water from the machineupon completion of the washing operation. This valve may be operatedautomatically or in any desired manner. Incoming water may be fedthrough the pipe 34 into compartment 35 wherein can be located a' heaterelement 36 for preheating the water before it is introduced .into thecirculation system through valve 31, said valve particular machine anduse for-which the filter is employed, and the term housing apertureincludes various types of housings. During the rinsing portion of thewashing cycle, or when the filter is not to be used, valve 10 may beprovided and operated in any suitable manner for by-passing the filter.When port 29 is closed by valve 10, the water will follow passage 12 tochamber 3| and thence to the impeller 24 through chamber 32. Rinse watermay be drained through the filter by operating valve 10 to close H andopen valve 33 to a position closing the port to chamber 3 Referring toFig. 2, the frame of the machine is shown at 30 with the chamber belowthe filter indicated at 3|. The filter comprises a front cover plate 39having a handle 40- for removing the same from the front of the..machineframe 30. This cover may be so designed as to have a watertight joint llwith the frame of the machine, or a separate water-tight door may beprovided in frame 30. Attached to the front cover plate 39 are rods 42(Figs. 2 and 3). These rods parts in the position shown in Fig. 2.Detent 46 may consist of ball 41, spring 48 and plug 49 located in asuitable aperture in the rear guide rods being screwed, molded in, orotherwise fastened into the front cover plate 35. The rods may be ofmetal, plastic, or any suitable material. The rods may be arranged invarious manners in accordance with the desired filter arrangement andmay be spaced in accordance with the filter action desired. As shown inFig. 3. the rods are arranged in diagonal rows and the central portionthereof omitted to form a basket as shown diagrammatically at 58, it isdesirable to clean the filter. -The first operation is that shown inFig. 5, wherein the front cover plate is pulled to the left, which moveswith it the'rear guide plate 45 until said guide plate is stopped byretaining ledges 54 and 55. The guide plate is held in position by meansof detents 55. Further movement to the left. or withdrawal (Fig. 6),

will separate the guide rods 42 and filter rods 1 5| from the rear guideplate 45, detents 45 allowing ring 43 to be withdrawn from aperture 44.Rear guide plate 45 may have the apertures receiving the filter rods 5|slightly countersunk, as shown at 60 in Fig. 6, with rods 5| looselyfitting in holes 6|.

The next operation in the cleaning of the filter is shown in Fig. 7,wherein the cleaning and rod guide plate 62 is moved to the rear in sucha manner as to strip oil the dirt from the rods. The cleaning and rodguide plate 62 may have apertures 53, through which the rods 42 passwith a stop or annular shoulder made by having the aperture enlarged atthe end facing the rear of the housing, so plate 62 will not be entirelywithdrawn from the filter assembly because ring 45 will contact shoul-(ler 13. After the filter has been cleaned, the reassembly operationtakes place, as shown in Fig. 8, wherein the cleaning and rod guideplate 62 is passed into the front opening 54 until it contacts theretaining ledges of the filter holder. and then as the cover 39 is movedto the right so as to move the rods 5|, the ends of said rods will beguided into their apertures 50 of the rear guide plate 45.

Further movement of the front cover plate to the right, as shown in Fig.8, will move the rear guide plate 45 tothe right, from the detents 59until the apparatus-takes the position shown in Fig. 2.

As previously stated, other forms and arrangements of the filter rodsmay be used and the filter may be employed by itself in a conduit or inconjunction with other machines.

that the front guide,

disengaging the same What isclaimed is:

1. In an apparatusincluding a filter chamber. an inlet to said filterchamber and an outlet therefrom; filter means adapted to be removablypositioned in said chamber between said inlet and outlet, said filteringmeans comprising an assembly of a removable side wall of said chamber, aplurality of substantially parallel filter rods uniformly spaced fromeach other in a la teral direction, rigidly attached to said wall andextending therefrom across said chamber transversely ard laterallythereof, a cleaning plate provided with a plurality of apertures throughwhich said rods pass, slidably mounted on said rods; and means in saidchamber walls releasably engaging said cleaning plate to normallyposition it adjacent said removable wall, whereby when said filterassembly has been removed from said chamber said cleaning plate may bemoved lengthwise of said rods to remove debris therefrom.

2. Apparatus according to claim' 1 comprising guide rods secured to saidremovable side wall in substantially parallel relation to said filtersupporting plate carried by said filter rod supporting plate comrods, afilter rod guide rods, said prising means support the ends of said guiderods.

3. Apparatus according to claim 2 comprising detachable connectionsbetween said supporting plate and said guide rods whereby saidsupporting plate is moved across said filter chamber as said filtermeans is withdrawn therefrom.

4. Apparatus according to claim 3 in which said filter chamber comprisesan abutment adapted to engage and stop said supporting plate after saidmovement across said filter chamber, said detachable connectionsenabling the separation of said filter means from said supporting platewhen said supporting plate is engaged by said abutment.

5. Apparatus according to claim 4 comprising yieldable detent meansadapted to retain said supporting plate adjacent said abutment whilesaid guide rods are detached from and reconnected to said supportingplate.

ELlSWORTl-I M. wnlson.

REFERENCES crrEn 'The following references are of record in thefile ofthis patent:

UNITED STATES PATENTS adapted to receive and releasably

